TY  - BOOK
AU  - SIELE, John Arap
AU  - HACKER, Gerry
TI  - Teaching science at a distance
SN  - 0903632144
PY  - 1977///
CY  - Cambridge
PB  - International Extension College
KW  - Distance education
KW  - Science
KW  - Study and teaching
N1  - Includes bibliographical references
ER  -