海量图书期刊资源,随时随地畅享阅读乐趣
APPARATUS FOR DEMONSTRATING THE HYDRAULIC PRESSHarold H. Metcalf · 1925
ASSOCIATION NEWSHarold H. Metcalf · 1937
ON TO CINCINNATIHarold H. Metcalf · 1937
A CHALLENGE TO CHICAGOHarold H. Metcalf · 1938
JAMES H. SMITHHarold H. Metcalf · 1938
SPEAKERS FOR THE 1939 CONVENTIONHarold H. Metcalf · 1939
NATIONAL SCIENCE COMMITTEE AT WORKHarold H. Metcalf · 1939