TY  - BOOK
AU  - Burton, William Butler.
TI  - Sagittarius spiral arm & the general distribution of hydrogen between 0 & 90 longitude:streaming & geometrical effects on the derivation of density
U1  - 520/525(043.2) BUR 
PY  - 1970///
PB  - Sterrwacht Leiden
KW  - Astronomy
KW  - Physics
ER  -