This is an older EPA product. It may be available from EPA's National Service Center for Environmental Publications (NSCEP) and it should be available from the National Technical Information Service (NTIS).

• Search the NSCEP publications database
• Search the National Technical Information Service online database

If the publication you seek is not found at either site, you may also wish to contact the NTIS Sales Desk (1-800-553-6847 or (703) 605-6000, 8 a.m. - 6 p.m.; EST, Mon-Fri) to verify a title or order number for you. You may also e-mail your inquiry to them at info@ntis.gov.

Reference: RAPID AQUATIC TOXICITY ASSAY USING INCORPORATION OF TRITIATED-THYMIDINE INTO SEA URCHIN, 'ARBACIA PUNCTULATA', EMBRYO: EVALUATION OF TOXICANT EXPOSURE PROCEDURES (EPA600D86077)