Stoltzfus, John C.
The complete guide to science-fair competition / by John C. Stoltzfus and Morris N. Young. - New York : Hawthorn, 1972. - 245 p. : ill.
Includes bibliographical references.
74133435
Science--Exhibitions.
507.4
The complete guide to science-fair competition / by John C. Stoltzfus and Morris N. Young. - New York : Hawthorn, 1972. - 245 p. : ill.
Includes bibliographical references.
74133435
Science--Exhibitions.
507.4