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The Abhidhammatthasangaha is the most basic and highly esteemed commentary on the Abhidhamma. This translation, from Shwe Zan Aung (written between 1895 and 1905), was revised and edited by Mrs. C.A.F Rhys Davids and first printed by PTS in 1910.
PTS Pali edition: Abhidhammatthasangaha
See also Bhikkhu Bodhi's masterful translation A Comprehensive Manual of Abhidhamma