Thesis (PH. D.) University of Pennsylvania, 1918.Bibliography: p. [77]Mode of access: Internet
"Reprinted from Political economy, vol. 20, no. 7. July, 1912."Mode of access: Internet
"Advance sheets--field operations of the Bureau of Soils, 1917".Mode of access: Internet
"Extracted from the Pennsylvania magazine of history and biography, vol. VII, no. 2, 1883."Mode of a...
Thesis (PH.d.)--University of Pennsylvania, 1918.Bibliography: p. [77].Mode of access: Internet
"General references consulted ": p. xv-xxi.Published also as thesis (PH. D.) Columbia university, 19...
First edition, Philadelphia, 1862."Catalogue of works consulted": p. iv.Mode of access: Internet
Thesis (Ph. D.)--University of Pennsylvania, 1922.Bibliography: p. 160-161.Mode of access: Internet
Thesis (M.A.)--Univ. of California. May, 1921.Bibliography: p. 82-86.Mode of access: Internet
Also published in the Report of the Citizens' committee on the finances of Pennsylvania (1923).Mode ...
Vita.Thesis (Ph.D.) - Columbia University, 1915.Bibliography: p. 134.Mode of access: Internet
Proceedings of the Delaware County institute of science, 1906, i, 49-76.Mode of access: Internet
Thesis (PH.D.)--University of Pennsylvania, 1916.Bibliography: p. [85]-87.Mode of access: Internet
Issued by Bureau of Statistics and Information 1914-1925; by Bureau of Statistics, 1928-Mode of acce...
Thesis (PH.D.)--University of Wisconsin.Bibliography: p.[126]Mode of access: Internet
The authors' thesis (PH.D.)--University of Pennsylvania, 1914.Mode of access: Internet
"Reprinted from Political economy, vol. 20, no. 7. July, 1912."Mode of access: Internet
"Advance sheets--field operations of the Bureau of Soils, 1917".Mode of access: Internet
"Extracted from the Pennsylvania magazine of history and biography, vol. VII, no. 2, 1883."Mode of a...
Thesis (PH.d.)--University of Pennsylvania, 1918.Bibliography: p. [77].Mode of access: Internet
"General references consulted ": p. xv-xxi.Published also as thesis (PH. D.) Columbia university, 19...
First edition, Philadelphia, 1862."Catalogue of works consulted": p. iv.Mode of access: Internet
Thesis (Ph. D.)--University of Pennsylvania, 1922.Bibliography: p. 160-161.Mode of access: Internet
Thesis (M.A.)--Univ. of California. May, 1921.Bibliography: p. 82-86.Mode of access: Internet
Also published in the Report of the Citizens' committee on the finances of Pennsylvania (1923).Mode ...
Vita.Thesis (Ph.D.) - Columbia University, 1915.Bibliography: p. 134.Mode of access: Internet
Proceedings of the Delaware County institute of science, 1906, i, 49-76.Mode of access: Internet
Thesis (PH.D.)--University of Pennsylvania, 1916.Bibliography: p. [85]-87.Mode of access: Internet
Issued by Bureau of Statistics and Information 1914-1925; by Bureau of Statistics, 1928-Mode of acce...
Thesis (PH.D.)--University of Wisconsin.Bibliography: p.[126]Mode of access: Internet
The authors' thesis (PH.D.)--University of Pennsylvania, 1914.Mode of access: Internet
"Reprinted from Political economy, vol. 20, no. 7. July, 1912."Mode of access: Internet
"Advance sheets--field operations of the Bureau of Soils, 1917".Mode of access: Internet
"Extracted from the Pennsylvania magazine of history and biography, vol. VII, no. 2, 1883."Mode of a...