Elrod, J. McRee.
Classification / by J. McRee Elrod. - 2d ed. - Metuchen, N.J. : Scarecrow Press, 1978. - viii, 79 p. : ill. ; 22 cm. - Modern library practices series ; no. 3. .
69006.
0810810948
77017282 //r80
Classification, Dewey decimal--Programmed instruction.
Classification, Library of Congress--Programmed instruction.
Classification / by J. McRee Elrod. - 2d ed. - Metuchen, N.J. : Scarecrow Press, 1978. - viii, 79 p. : ill. ; 22 cm. - Modern library practices series ; no. 3. .
69006.
0810810948
77017282 //r80
Classification, Dewey decimal--Programmed instruction.
Classification, Library of Congress--Programmed instruction.