"Photometric measurements of the variable stars [beta] Persei and DM. 812̊5, made at the Harvard College Observatory"@en . . . "Photometric measurements of the variable stars [beta] Persei and DM. 81°25, made at the Harvard College Observatory" . . . "Photometric measurements of the variable stars [beta] Persei and DM. 81° 25, made at the Harvard College Observatory" . "Photometric measurements of the variable stars [beta] Persei and DM. 81° 25, made at the Harvard College Observatory"@en . . . . . . . . . . . . "Photometric measurements of the variable stars [beta] Persei and DM. 81 [degré] 25, made at the Harvard College Observatory" . . . . . . . . . "American Academy of Arts and Sciences." . . . . "Harvard College Observatory." . .