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More magic tricks, science facts /
by Friedhoffer, Robert.
Publication:
New York : F. Watts, 1990
. 111 p. :
24 cm.
Date:1990
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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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