Elrod, J. McRee.
Classification / by J. McRee Elrod. - 2d ed. - Metuchen, N.J. : Scarecrow Press, 1978. - viii, 79 p. : ill. ; 22 cm. - His Modern library practices series ; no. 3 .
0810810948
77017282
Classification, Dewey decimal--Programmed instruction.
Classification, Library of Congress--Programmed instruction.
Z674.E47 1978
Classification / by J. McRee Elrod. - 2d ed. - Metuchen, N.J. : Scarecrow Press, 1978. - viii, 79 p. : ill. ; 22 cm. - His Modern library practices series ; no. 3 .
0810810948
77017282
Classification, Dewey decimal--Programmed instruction.
Classification, Library of Congress--Programmed instruction.
Z674.E47 1978