The Seven wonders of Sassafras Springs
Birney, Betty G.
New York : Atheneum Books for Young Readers, 2005.

The world according to Humphrey
Birney, Betty G.
New York : G.P. Putnam's Sons, [2004]

The world according to Humphrey
Birney, Betty G.
New York : G.P. Putnam's Sons, [2004]

Adventure according to Humphrey
Birney, Betty G.
New York : Puffin Books, 2010.

Friendship according to Humphrey
Birney, Betty G.
New York : G.P. Putnam's Sons, 2005.

Humphrey's really wheely racing day
Birney, Betty G.
New York, NY : G.P. Putnam's Sons, an imprint of Penguin Group (USA), [2014]

Humphrey's really wheely racing day
Birney, Betty G.
New York, NY : G.P. Putnam's Sons, an imprint of Penguin Group (USA), [2014]

Humphrey's really wheely racing day
Birney, Betty G.
New York, NY : G.P. Putnam's Sons, an imprint of Penguin Group (USA), [2014]

Humphrey's really wheely racing day
Birney, Betty G.
New York, NY : G.P. Putnam's Sons, an imprint of Penguin Group (USA), [2014]

Imagination : according to Humphrey
Birney, Betty G.
New York, NY : G. P. Putnam's Sons, an imprint of Penguin Group (USA), [2015].

Imagination : according to Humphrey
Birney, Betty G.
New York, NY : G. P. Putnam's Sons, an imprint of Penguin Group (USA), [2015].

Imagination : according to Humphrey
Birney, Betty G.
New York, NY : G. P. Putnam's Sons, an imprint of Penguin Group (USA), [2015].

El mundo de acuerdo a Humphrey = World according to Humphrey
Birney, Betty G., author.
New York, New York, U.S.A. : Puffin Books, an imprint of Penguin Group (USA), 2015.

El mundo de acuerdo a Humphrey = World according to Humphrey
Birney, Betty G., author.
New York, New York, U.S.A. : Puffin Books, an imprint of Penguin Group (USA), 2015.

Imagination : according to Humphrey
Birney, Betty G.
New York, NY : G. P. Putnam's Sons, an imprint of Penguin Group (USA), [2015].

Imagination : according to Humphrey
Birney, Betty G.
New York, NY : G. P. Putnam's Sons, an imprint of Penguin Group (USA), [2015].

Adventure according to Humphrey
Birney, Betty G.
New York : Puffin Books, 2010.

Surprises according to Humphrey
Birney, Betty G.
New York : Puffin Books, [2008]

Imagination : according to Humphrey
Birney, Betty G.
New York, NY : G. P. Putnam's Sons, an imprint of Penguin Group (USA), [2015].

Humphrey's creepy-crawly camping adventure
Birney, Betty G., author.
New York, NY : G. P. Putnam's Sons, an imprint of Penguin Group (USA), [2015]

Humphrey's creepy-crawly camping adventure
Birney, Betty G., author.
New York, NY : G. P. Putnam's Sons, an imprint of Penguin Group (USA), [2015]

Humphrey's creepy-crawly camping adventure
Birney, Betty G., author.
New York, NY : G. P. Putnam's Sons, an imprint of Penguin Group (USA), [2015]

Humphrey's school fair surprise
Birney, Betty G., author.
New York, NY : G.P. Putnam's Sons, an imprint of Penguin Group (USA), [2016]

Spring according to Humphrey
Birney, Betty G., author.
New York, NY : G.P. Putnam's Sons, [2016]

Trouble according to Humphrey
Birney, Betty G.
New York : Putnam, [2007]

Humphrey's mixed-up magic trick
Birney, Betty G., author.
New York, NY : G. P. Putnam's Sons, [2016]

Humphrey's mixed-up magic trick
Birney, Betty G., author.
New York, NY : G. P. Putnam's Sons, [2016]

Humphrey's mixed-up magic trick
Birney, Betty G., author.
New York, NY : G. P. Putnam's Sons, [2016]

Humphrey's mixed-up magic trick
Birney, Betty G., author.
New York, NY : G. P. Putnam's Sons, [2016]

Humphrey's mixed-up magic trick
Birney, Betty G., author.
New York, NY : G. P. Putnam's Sons, [2016]

Humphrey's mixed-up magic trick
Birney, Betty G., author.
New York, NY : G. P. Putnam's Sons, [2016]

Summer according to Humphrey
Birney, Betty G.
New York : G.P. Putnam's Sons, [2010]

Summer according to Humphrey
Birney, Betty G.
New York : G.P. Putnam's Sons, [2010]

Humphrey's creepy-crawly camping adventure
Birney, Betty G., author.
New York, NY : G. P. Putnam's Sons, an imprint of Penguin Group (USA), [2015]

Humphrey's really wheely racing day
Birney, Betty G.
New York, NY : G.P. Putnam's Sons, an imprint of Penguin Group (USA), [2014]

Humphrey's really wheely racing day
Birney, Betty G.
New York, NY : G.P. Putnam's Sons, an imprint of Penguin Group (USA), [2014]

Humphrey's school fair surprise
Birney, Betty G., author.
New York, NY : G.P. Putnam's Sons, an imprint of Penguin Group (USA), [2016]

Humphrey's creepy-crawly camping adventure
Birney, Betty G., author.
New York, NY : G. P. Putnam's Sons, an imprint of Penguin Group (USA), [2015]

Humphrey's creepy-crawly camping adventure
Birney, Betty G., author.
New York, NY : G. P. Putnam's Sons, an imprint of Penguin Group (USA), [2015]

Humphrey's creepy-crawly camping adventure
Birney, Betty G., author.
New York, NY : G. P. Putnam's Sons, an imprint of Penguin Group (USA), [2015]

Humphrey's creepy-crawly camping adventure
Birney, Betty G., author.
New York, NY : G. P. Putnam's Sons, an imprint of Penguin Group (USA), [2015]

Humphrey's creepy-crawly camping adventure
Birney, Betty G., author.
New York, NY : G. P. Putnam's Sons, an imprint of Penguin Group (USA), [2015]

Humphrey's creepy-crawly camping adventure
Birney, Betty G., author.
New York, NY : G. P. Putnam's Sons, an imprint of Penguin Group (USA), [2015]

Humphrey's playful puppy problem
Birney, Betty G.
New York, NY : G.P. Putnam's Sons, an imprint of Penguin Group (USA), [2014]

Humphrey's playful puppy problem
Birney, Betty G.
New York, NY : G.P. Putnam's Sons, an imprint of Penguin Group (USA), [2014]

Humphrey's playful puppy problem
Birney, Betty G.
New York, NY : G.P. Putnam's Sons, an imprint of Penguin Group (USA), [2014]

Humphrey's playful puppy problem
Birney, Betty G.
New York, NY : G.P. Putnam's Sons, an imprint of Penguin Group (USA), [2014]

Humphrey's playful puppy problem
Birney, Betty G.
New York, NY : G.P. Putnam's Sons, an imprint of Penguin Group (USA), [2014]

Humphrey's playful puppy problem
Birney, Betty G.
New York, NY : G.P. Putnam's Sons, an imprint of Penguin Group (USA), [2014]

Humphrey's playful puppy problem
Birney, Betty G.
New York, NY : G.P. Putnam's Sons, an imprint of Penguin Group (USA), [2014]