TY  - BOOK
AU  - Edward C. Pickering
TI  - A Plan for Securing Observations of the Variable Stars
KW  - Astronomy
UR  - https://new.zodml.org//sites/default/files/2023-06/a_plan_for_securing_observations_of_the_variable_stars_by_edward_c._pickering_tag_variable_stars.epub
ER  -