TY  - BOOK
AU  - Polgreen,John
AU  - Polgreen,Cathleen
TI  - Sunlight and shadows
AV  - QC 381.6 .P64
U1  - 525/.5 
PY  - 1967///
CY  - Garden City, N.Y.
PB  - Doubleday
KW  - Seasons
KW  - Juvenile literature
KW  - Shades and shadows
KW  - Solar radiation
KW  - Shadows
N2  - An explanation of why shadows exist and how they are affected by changing seasons
UR  - http://www.archive.org/details/sunlightshadows00polg
UR  - http://www.openlibrary.org/books/OL5534148M
ER  -