Emil Wilhelm Lehmann / Tracy Allen Pitzen

UIUC:30112069219365

Drainage

Arthur Samuel Colby / Emil Wilhelm Lehmann / Harold Clayton M. Case / Herbert Howard Alp / John Henry Bigger / Lee Adrian Somers / Ray Iris Shawl / Walter August Huelsen / Willard Jason Corbett / William Barbour Nevens / Milton Dyer Farrar / Wesley Pillsbury Flint / Alvin Frederick Kuhlman / Joseph Ackerman / Paul Hubert Tracy / Tracy Allen Pitzen

UIUC:30112070028409

Agriculture

Emil Wilhelm Lehmann / Tracy Allen Pitzen

UIUC:30112069219365

Drainage

Emil Wilhelm Lehmann / Harrison August Ruehe / Milton Dyer Farrar / Robert Graham / Walter August Huelsen / William Barbour Nevens / Tracy Allen Pitzen

UIUC:30112039962318

Agriculture

Emil Wilhelm Lehmann / Herbert Howard Alp / Milton Dyer Farrar / Ray Iris Shawl / Willard Jason Corbett / William Barbour Nevens / Alvin Frederick Kuhlman / Paul Hubert Tracy / Tracy Allen Pitzen / Wesley Pillsbury Flint

OCLC:12699407

Agriculture