Place but not Date of Birth Influences the Development and Emergence of Athletic Talent in American Football

The purpose of this study was to examine the birthplace and relative age effects in National Football League (NFL) players. The place and date of birth of NFL players in the United States were analyzed with Monte Carlo simulations to determine if either factor was predictive of the probability of reaching the elite level in this sport. Consistent with previous findings on professional North American athletes in baseball, ice hockey, basketball, and golf, players born in cities with populations of less than 500,000 were significantly over-represented in the NFL, whereas players born in cities with populations over 500,000 were significantly under-represented. Unlike many other sports, no relative age effects were found for the NFL. Small cities, in particular, appeared to possess characteristics that facilitate the development and/or emergence of athletic talent in American football. Possible psychosocial factors mediating the birthplace effect are discussed as are implications for the development of sporting expertise.

Health services for American Indians.

Mode of access: Internet.

A report on the National Seminar of American Indian Women, held August 2-8, 1970 at Colorado State University, Fort Collins, Colorado.

Sponsored by the Country Women's Council, U.S.A. and the Associated Country Women of the World societies in the United States.

Check list of the Cicadellidae (Homoptera) of America, north of Mexico,

A revision of the list of the North American Cicadellidae, published in 1937, by DeLong and Caldwell. cf. Introd.

A catalog of the Diptera of America north of Mexico;

"Periodicals cited, with explanations": p. 1485-1547.

Monographs of the Diptera of North America /

Part 2 by H. Loew, edited by R. Osten Sacken (dated Jan. 1864); pt. 3 by H. Loew (dated Dec. 1873); pt. 4 by R. Osten Sacken (dated Jan. 1869)

The American Galloway herd book.

Mode of access: Internet.

Manual of botany, for North America : containing generic and specific descriptions of the indigenous plants and common cultivated exotics, growing north of the Gulf of Mexico /

Botanical grammar and dictionary: [13]-63, [71] p. at end.

Manual of botany for North America: containing generic and specific descriptions of the indigenous plants and common cultivated exotics, growing north of the Gulf of Mexico.

Includes index.

American missionaries at the Sandwich islands.

Defends the missionaries from charges made in the "Voyage of H.M.S. Blonde."

The butterfly book: a popular guide to a knowledge of the butterflies of North America,

Each plate accompanied by guard sheet with descriptive letterpress.

History of the Pacific states of North America.

With changed title-pages and binder's titles, including the same material as his Works, San Francisco, 1882-90, 39 v.; omitting v. 1-5, The native races of the Pacific states ...

Rare American history, being the library of a well-known Philadelphia collector ... : to be sold Friday afternoon and evening, February 4th, 1910 ... Saturday morning and afternoon, February 5th, 1910 ... oder of slae, first sitting lots 1 to 350, second [sitting] [lots] 351 to 700, third [sitting] [lots] 701 to 1050, fourth [sitting] [lots] 1051 to end /

" ... comprising an extensive collection of works on the North American Indians; a large and select collection of genealogies, an unusual accumulation of church histories, and general American history, embracing state, county and town history, inland voyages and travels, narratives, biographies, bibliography, Revolutionary history, early poetry, &c."

The moth book; a popular guide to a knowledge of the moths of North America.

Each plate accompanied by guard sheet with descriptive letterpress.

Manual of botany for North America: containing generic and specific descriptions of the indigenous plants and common cultivated exotics, growing north of the gulf of Mexico.

pt. 1. North American plants, arranged according to the Linnean artificial method: improved by Persoon, Pursh, Nuttall, and others.--pt. 2. North American plants, arranged according to Jussieu's natural method; improved by Lindley, Brown, De Candolle and others.