TY  - BOOK
AU  - Waugh,Albert E.
TI  - Sundials: their theory and construction 
SN  - 0486229475 :
U1  - 529.78 
PY  - 1973///
CY  - New York
PB  - Dover Publications
KW  - Sundials
N1  - Bibliography: p. 225-226
ER  -