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Nesting of the Mexican Jay in the Santa Rita Mountains, Arizona
Alfred O. Gross

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The Seventy-five Per Cent Rule for Subspecies
Dean Amadon

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Validity of the Shorebird Genus Pseudoscolopax
George Miksch Sutton

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Recent Notes from the Lower Colorado River Valley of Arizona and California
Gale Monson

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A Combined Early Record of Duck Shooting on the Suisun Marshes of California
Emerson A. Stoner

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Notes and News
The Condor

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Publications Reviewed
Carl B. Koford

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Cooper Club Meetings
The Condor

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Index to Volume 51
Ethel E. Richardson

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Back Matter (PDF)
The Condor

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Front Matter (PDF)
The Condor

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Report on the Colonial Nesting Birds of Great Salt Lake, 1947-49
William H. Behle

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The Correct Name for the Mexican Crested Flycatcher
H. G. Deignan

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A Record of the Alberta Fox Sparrow in Manitoba
L. L. Snyder

The Starling Reaches the Pacific
Alex. Walter

Further Records of the Starling in Oregon
Charles W. Quaintance

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Range Extension of Ash-throated Flycatcher
Ben H. Pruitt

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Black-chinned Hummingbird in Tarrant County, Texas
Philip F. Allan

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A Guerrero Whip-poor-will Impaled by an Inset
Miguel Alvarez Toro

Catching Petrels by Flashlight
Louis B. Bishop

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Ground Dove and Black-chinned Sparrow in Southern Nevada
Ross Hardy

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Wood Pewee Pursues Bat
Edmund C. Jaeger

Starlings on Point Reyes Peninsula, Marin County, California
Gordon W. Gullion

Vagrant Black-billed Magpie in Ventura County, California
Carl B. Koford

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Fur Seals and Murre Chicks
Karl W. Kenyon

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The Incidence of Hybrids in Migrant Blue and Snow Geese in Kansas
Charles G. Sibley