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Toying around with science : the physics behind toys and gags /
by Friedhoffer, Robert.
Publication:
New York : Franklin Watts, 1995
. 95 p. :
24 cm.
Date:1995
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Forces, motion, and energy /
by Friedhoffer, Robert.
Publication:
New York : F. Watts, 1992
. 112 m. :
24 cm.
Date:1992
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Light /
by Friedhoffer, Robert.
Publication:
New York : F. Watts, 1992
. 110 p. :
25 cm.
Date:1992
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(1),
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