Young People's Science Encyclopedia's and The Webster's Unified Dictionary and Encyclopedia's For Sale. The Webster Series From A to Z Information Printed in 160 with info from the 1940's books. The Young's Science Books are A to Z info for Science buffs, Printed in 1960's 5th Series. Webster 15 Hard Cover Books. 25 Hard Cover Young's Science Books Hard Covers. Series offer please. Please email me for more info. Thanks Gene