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- 31021241 contributor B776503.
- 31021241 contributor B776504.
- 31021241 created "1931.".
- 31021241 date "1931".
- 31021241 date "1931.".
- 31021241 dateCopyrighted "1931.".
- 31021241 extent "227 p.".
- 31021241 issued "1931".
- 31021241 issued "1931.".
- 31021241 language "eng".
- 31021241 publisher "Chicago, Thomas S. Rockwell company,".
- 31021241 subject "504".
- 31021241 subject "Q171 .M33".
- 31021241 subject "Science.".
- 31021241 title "Steps in the dark [by] Milton Mayer and John Howe.".
- 31021241 type "text".