An official website of the United States government.

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

Concept Breadcrumbs

Preferred Term:

physical phases

Concept Schemes:
NALT Core
NALT Full
Broader Concept:
URI:
https://lod.nal.usda.gov/nalt/182
Download this Concept:
RDF/XMLCreated 2006-01-19, last modified 2015-02-26