[by Janette Sebring Lowrey ; illustrated by Gustaf Tenggren] . Gertrude Crampton ; illustrated by Tibor Gergely . by K.&B. Jackson ; illustrted by Gustaf Tenggren
Thomas A. Sebring, Torben Andersen, chair/editor ; sponsored by SPIE--the International Society for Optical Engineering ; cosponsored by the Eurpoean Southern Observatory ; corporate sponsor, DFM Engineering