๐”– Bobbio Scriptorium
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Unusual Waterbirds in El Paso County, Colorado

โœ Scribed by W. S. Long

Book ID
124586965
Publisher
University of California Press
Year
1938
Tongue
English
Weight
103 KB
Volume
55
Category
Article
ISSN
0004-8038

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A case-control study was conducted in El Paso County, Colorado to estimate differences in risk of head injury among persons in motorcycle crashes who were or were not wearing helmets. There were 71 cases, motorcyclists with head injuries from crashes, and 417 controls, motorcyclists in crashes witho