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CFR > Title 15 - Commerce and Foreign Trade > SUBTITLE B—Regulations Relating to Commerce and Foreign Trade > CHAPTER IX—NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (parts 902 to 996) > SUBCHAPTER B—OCEAN AND COASTAL RESOURCE MANAGEMENT (parts 921 to 932) > PART 921—NATIONAL ESTUARINE RESEARCH RESERVE SYSTEM REGULATIONS > SUBPART A—General (§921.1 to §921.4) > 921.3—National Estuarine Research Reserve System biogeographic classification scheme and estuarine typologies.

CFR

921.3—National Estuarine Research Reserve System biogeographic classification scheme and estuarine typologies.

(a) National Estuarine Research Reserves are chosen to reflect regional differences and to include a variety of ecosystem types. A biogeographic classification scheme based on regional variations in the nation's coastal zone has been developed. The biogeographic classification scheme is used to ensure that the National Estuarine Research Reserve System includes at least one site from each region. The estuarine typology system is utilized to ensure that sites in the System reflect the wide range of estuarine types within the United States.
(b) The biogeographic classification scheme, presented in appendix I, contains 29 regions. Figure 1 graphically depicts the biogeographic regions of the United States.
(c) The typology system is presented in appendix II.
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