The how and why wonder book of magnets and magnetism/
Keen, Martin L. 1969
The how and why wonder book of magnets and magnetism/ Martin L .Keen. - New York: Grosset & Dunlap Publishers, 1969. - 48p.: ill. - Vol. ii .
Q 163 .K44 1969
The how and why wonder book of magnets and magnetism/ Martin L .Keen. - New York: Grosset & Dunlap Publishers, 1969. - 48p.: ill. - Vol. ii .
Q 163 .K44 1969