海量图书期刊资源，随时随地畅享阅读乐趣
What does a steam horse-power cost?Thos. Pray Jr. · 1890
Wartime Problems of Jointly Administered Water and Sewage WorksWendell R. LaDue, James W. Myers Jr., John W. Pray and Thos. L. Amiss · Journal (American Water Works Association) · 1944