@article {643, title = {Drawings of a Comet}, volume = {XVIII}, year = {1910}, keywords = {comet, Douglass, drawing, popular astronomy}, author = {Douglass, A.E.} } @article {635, title = {A Summary of Planetary Work at the Lowell Observatory and the Conditions Under Which It Has Been Performed}, year = {1899}, keywords = {Douglass, lowell observatory, popular astronomy, summary}, author = {Douglass, A.E.} } @article {641, title = {Atmosphere, Telescope and Observer}, year = {1897}, keywords = {astronomy, atmosphere, Douglass, observation, observer, popular astronomy, telescope}, author = {Douglass, A.E.} }