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ILLUSTRATIONS--Continued

• 6. Example of a two-page field data sheet to record sampling information during collection of quantitative phytoplankton samples
• 7. Example of the 16-character sample identification code used by the National Water-Quality Assessment Program
• 8. Example of a field sample log that lists collection and disposition data for samples collected

TABLES

• Table 1. Abbreviations of study-unit names used in the 16-character sample identification codes

CONVERSION FACTORS AND ABBREVIATIONS

Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Geological Survey.