Matches in Library of Congress for { <http://lccn.loc.gov/61017233> ?p ?o. }
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- 61017233 contributor B1485406.
- 61017233 created "[c1961]".
- 61017233 date "1961".
- 61017233 date "[c1961]".
- 61017233 dateCopyrighted "[c1961]".
- 61017233 extent "115 p.".
- 61017233 issued "1961".
- 61017233 issued "[c1961]".
- 61017233 language "eng".
- 61017233 publisher "Washington, Teaching Research and Technology Division, Electronic Teaching Laboratories".
- 61017233 subject "371.3944".
- 61017233 subject "LB1028.5 .F6".
- 61017233 subject "Teaching machines.".
- 61017233 title "The world of teaching machines; programed learning and self-instructional devices.".
- 61017233 type "text".