God Speaks: The Theme of Creation and Its Purpose, is an important book by Meher Baba. It has been in print continuously since 1955. It greatly influenced the ideas in Evolution of Perception Re-Explained and is mentioned in the book frequently. You can download a free PDF copy of the 1973 second edition, excluding charts, here: https://drive.google.com/file/d/1U731DguBwyUHOhcxaEFaa31odkhHfrBI/view
Discourses by Meher Baba is another book that greatly influenced the concepts in Evolution of Perception. This is especially true of its explanation of the concept of sanskaras, which the idea of lenses is closely based on. You can download a free PDF copy of the 1987 seventh edition here: https://drive.google.com/file/d/1NtSJjcZkyJ8aX0lcRoPM1y83Mna8ZpRv/view
Intelligence Notebooks, edited by Chris Ott from scans of handwritten notebooks discovered in India in 1969 after Meher Baba's death and believed to be a fair copy of a work by Meher Baba. Download here: https://sites.google.com/site/intelligencematerials/home
Beams from Meher Baba on the Spiritual Panorama by Meher Baba. At its first publication in 1955, Baba's book God Speaks gave rise to questions on particular points of metaphysical detail. Meher Baba’s answers to these questions were compiled into the 13 essays of this book. https://drive.google.com/file/d/1XDYKaKbCE9JAU5-3wHPfG3mcIpL8W_7B/view?usp=sharing
The Everything and the Nothing by Meher Baba, a collection of 65 short messages, based on answers to questions that Meher Baba gave out in personal interviews during the early 60s. https://drive.google.com/file/d/1aTlCafjSDvzYJ33ozqfTGvIYhrXTHn_w/view?usp=sharing
Lord Meher, 1986 print edition, all 6,742 pages as individual files
https://drive.google.com/file/d/12Athhl0QGM1TrZhH2rVgHuHda0wdihJ4/view?usp=sharing
God in a Pill? Meher Baba on L.S.D. and the High Roads, a pamphlet on the teachings on illicit drug use by Meher Baba released in 1966
https://drive.google.com/file/d/1Vi9b-MFKhBXV-EhgXLt9CVgA1DgoRrzN/view?usp=sharing