00486nam a2200181 a 450000500170000000800410001704100080005808200100006610000300007624500400010626400400014630000250018649000250021150000260023665000110026265000120027370000190028520260717090945.0260717s1974    ii            000 0 eng d  aeng04a530.41 aLapp, Ralph Eugene, 1917-10aMatter /cLapp, Ralph Eugene, 1917- 1aNew York :bTime-life books,c1974.  a200 p. ill. ; 29 cm.0 aLife science library  aBibliography: p. 196. 4aMatter 4aPhysics1 aTime life book