Here are entered works on present-day calculators as well as on calculators and mechanical computers of pre-1945 vintage. Works on modern electronic computers first developed after 1945 are entered under Computers.
Here are entered works on counting, including counting books. Works on the theory and systems of numbering are entered under Numeration. Works on the psychology of numeration are entered under Number concept.
Here are entered works on counting, including counting books and counting books in rhyme. Works on rhymes traditionally used to count out or eliminate a player in a child's game are entered under Counting-out rhymes. Works on the theory and systems of numbering are entered under Number systems. Works on the psychology of numeration are entered under Number concept.
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