TY  - BOOK
AU  - Tannenbaum, Beulah.
AU  - Stillman, Myra.
TI  - Understanding time; the science of clocks and calendars; by Beulah Tannenbaum and Myra Stillman.  Illus. by William D. Hayes
T2  - Whittlesey House publications
CY  - New York, McGraw, 1958.
KW  - Calendars
KW  - Clocks and watches
ER  -