Proper motion survey with the forty-eight inch Schmidt telescope:
the zones +66 and +60, 6h to 20h.

APA Citation

Luyten, W. Jacob. (1971). Proper motion survey with the forty-eight inch Schmidt telescope: the zones +66 and +60, 6h to 20h. Minneapolis: University of Minnesota.

MLA Citation

Luyten, Willem Jacob, 1899-1994. Proper Motion Survey With the Forty-eight Inch Schmidt Telescope: the Zones +66 And +60, 6h to 20h. Minneapolis: University of Minnesota, 1971.

Warning: These citations may not always be complete (especially for serials).