Standard test method for determination of acid-insoluble residue in biomass - United States : ASTM International, 2010 - 3 p. : ill. ; 30 cm. - ASTM Standards . - ASTM Standards (ASTM International) . Designation : E1721 - 01 (Reapproved 2009) ISBN: RM144.10 Subjects--Topical Terms: Biomass