Author not established. 16 March at 13:51 [editorial display title]. Date not established. EHREA archive: /library/documents/doc-5193119edd91082b90b29e63/
[1] chem.php. Original source: http://www.ehrea.org/chem.php. Preserved original: /library/originals/308af7b77224bd2d4a30660b6efb79f24d18b1a2b39ddc77b24f18eb33993dba.html. SHA-256: 308af7b77224bd2d4a30660b6efb79f24d18b1a2b39ddc77b24f18eb33993dba