BUDDHISM
The Linked Discourses
Saṁyutta Nikāya: the third collection of the Sutta Piṭaka, grouped by subject rather than by length — the discourses on dependent origination, the aggregates, the senses and the path, gathered together with what they are about.
The whole of The Linked Discourses is held here and free to read, searchable by reference or by the words in it.
The edition held here is Sujato (2018) (2018), in English, released to the public domain under CC0, from SuttaCentral.
It sits on the estate's shelf of 106 sacred works, beside the complete Douay-Rheims Bible, an atlas of the places named in scripture, a timeline and a genealogy.