TY  - BOOK
AU  - Butler,Norman P.
TI  - Building and using binoscopes 
SN  - 9783319467887 - pbk
PY  - 2017///
CY  - 	Cham, Swizterland : 
PB  - Springer, 
KW  - 1. Telescopes -- Design and construction.
KW  - 2. NATURE -- Sky Observation.
KW  - 3. Astronomy, space & time
ER  -