河北省工業試驗所報告書
By: Hebei Sheng gong ye shi yan suo bian
Publisher: Hebei Sheng gong ye shi yan suo
Published: 1929
Place of publication: Tianjin
Language: chi
Subjects: Industrial Research
Other titles: Hebei Sheng gong ye shi yan suo bao gao shu
Notes: "GP26" (di 1 ci bao gao shu), "GP27"(di 2 ci bao gao shu)