Journal Article Does Conservation Involve Cost? Get access Willford I. King Willford I. King University of Wisconsin Search for other works by this author on: Oxford Academic Google Scholar The Quarterly Journal of Economics, Volume 30, Issue 3, May 1916, Pages 595–600, https://doi.org/10.2307/1885242 Published: 01 May 1916

Journal Article Recent Texts on the Methods of Economic Statistics Get access W. L. Crum W. L. Crum Harvard University Search for other works by this author on: Oxford Academic Google Scholar The Quarterly Journal of Economics, Volume 40, Issue 3, May 1926, Pages 530–546, https://doi.org/10.2307/1885176 Published: 01 May 1926