A text - book of physics /
Duff A. Wilmer
A text - book of physics / Edt A. Wilmer Duff - 5-th ed. - Philadelphia : P. Blakiston' s son& Co., 1921. - 700 p.: ill., 21 sm.
Physics
A text - book of physics / Edt A. Wilmer Duff - 5-th ed. - Philadelphia : P. Blakiston' s son& Co., 1921. - 700 p.: ill., 21 sm.
Physics