http://hdl.handle.net/1811/44823 2013-06-19T08:11:54Z http://hdl.handle.net/1811/44860 Science Observer: Volume 3, no. 7 (July 1941) American Institute of the City of New York 1941-07-01T00:00:00Z American Institute of the City of New York http://hdl.handle.net/1811/44859 Science Observer: Volume 3, no. 6 (June 1941) American Institute of the City of New York 1941-06-01T00:00:00Z American Institute of the City of New York http://hdl.handle.net/1811/44858 Science Observer: Volume 3, no. 5 (May 1941) American Institute of the City of New York 1941-05-01T00:00:00Z American Institute of the City of New York http://hdl.handle.net/1811/44857 Science Observer: Volume 3, no. 4 (April 1941) American Institute of the City of New York 1941-04-01T00:00:00Z American Institute of the City of New York http://hdl.handle.net/1811/44842 Science Observer: Volume 3, no. 3 (March 1941) American Institute of the City of New York 1941-03-01T00:00:00Z American Institute of the City of New York http://hdl.handle.net/1811/44839 Science Observer: Volume 3, no. 2 (February 1941) American Institute of the City of New York 1941-02-01T00:00:00Z American Institute of the City of New York http://hdl.handle.net/1811/44837 Science Observer: Volume 2, no. 9 (December 1940) American Institute of the City of New York 1940-12-01T00:00:00Z American Institute of the City of New York http://hdl.handle.net/1811/44833 Science Observer: Volume 2, no. 8 (November 1940) American Institute of the City of New York 1940-11-01T00:00:00Z American Institute of the City of New York http://hdl.handle.net/1811/44832 Science Observer: Volume 2, no. 7 (October 1940) American Institute of the City of New York 1940-10-01T00:00:00Z American Institute of the City of New York http://hdl.handle.net/1811/44831 Science Observer: Volume 2, no. 6 (June 1940) American Institute of the City of New York 1940-06-01T00:00:00Z American Institute of the City of New York http://hdl.handle.net/1811/44828 Science Observer: Volume 2, no. 5 (May 1940) American Institute of the City of New York 1940-05-01T00:00:00Z American Institute of the City of New York http://hdl.handle.net/1811/44827 Science Observer: Volume 2, no. 4 (April 1940) American Institute of the City of New York 1940-04-01T00:00:00Z American Institute of the City of New York http://hdl.handle.net/1811/44825 Science Observer: Volume 2, no. 3 (March 1940) American Institute of the City of New York 1940-03-01T00:00:00Z American Institute of the City of New York http://hdl.handle.net/1811/44824 Science Observer: Volume 2, no. 2 (February 1940) American Institute of the City of New York 1940-02-01T00:00:00Z American Institute of the City of New York