Cofnodion Cymdeithas Edward Llwyd, yn cynnwys: cyfansoddiad y Gymdeithas; cofnodion cyfarfodydd blynyddol; cofnodion y Pwyllgor Gwaith, yr Is-bwyllgor Monograffig, yr Is-bwyllgor Marchnata, yr Is-bwyllgor Enwau a Thermau, ac Is-bwyllgor yr Amgylchedd; gohebiaeth; ceisiadau am grantiau; papurau ariannol; a phapurau aelodaeth. = Records of Cymdeithas Edward Llwyd (the Edward Llwyd Society), including: the Society's constitution; minutes of annual meetings; records of the Working Committee, the Monographic Sub-Committee, the Marketing Sub-Committee, the Names and Terms Sub-Committee, and the Environment Sub-Committee; correspondence; applications for grants; financial papers; and membership papers.