shipping is $1 per book if you get at least 4, otherwise it is by weight, 
starting at $3.50.  

WHAT IS A LASER?  hb, xlib, "Explains what lasers are, how they work, and some 
of the amazing things they can do"  48 pp, exc cond, $5

LASERS, THE INCREDIBLE LIGHT MACHINES, hb xlib, "Explains the common operating 
principles of lasers, their diverse roles n industry, medicine, communications, 
and the military; and their potential in solving the energy crisis"  90 pp, 
photos, jr high and up, $6

A LOOK INSIDE LASERS, hb, xlib, 48 pp, photos, "Discusses the development of 
the first modern laser, the parts of a laser and how they work, and 
applications of lasers in medicine and technology" laser art too, $6

THE ELECTROMAGNETIC SPECTRUM,Key to the Universe,  hb, xlib, "An explanation of 
the nature of the electromagnetic spectrum, the scientific investigations that 
led to our understanding of it and its role as a tool of science"  126 pp, vg 
cond, $7

INVENTIONS AND DISCOVERIES, large hb, from the first tools , to energy, 
building skyscrapers, medicine, transportation, war and communications, 
bicycles, toys, cameras... including a time chart and fact index, nicely 
illustrated for everyone's enjoyment, vg cond, $6

/51ffe6e09abaa66e04954st01duc
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