Quick links to Literature by HPB
Secret Doctrine
https://universaltheosophy.com/hpb/secretdoctrine.html
Proem to the Secret Doctrine
https://www.phx-ult-lodge.org/Aproem.htm
Isis Unveiled
Vol I https://www.phx-ult-lodge.org/isis_unveiled1.htm
Vol II https://www.phx-ult-lodge.org/Isis_Unveiled.htm
Theosophical Glossary
https://www.phx-ult-lodge.org/Thegloss.htm
Voice of the Silence
https://www.phx-ult-lodge.org/asound.htm
Key To Theosophy
https://www.phx-ult-lodge.org/Aproem.htm
HPB Articles Vol. I, II, and III
https://www.theosophy-ult.org.uk/wp-content/uploads/2018/10/HPB-Theosophical-Articles-Vols-1-2-3.pdf
Transactions of a Blavatsky Lodge
https://www.phx-ult-lodge.org/Transactions.htm
Five Messages
https://www.phx-ult-lodge.org/five_messages.htm
Five Years of Theosophy
https://www.phx-ult-lodge.org/five-years.htm
Raja Yoga and Occultism
https://www.theosophy-ult.org.uk/wp-content/uploads/2019/08/Raja-Yoga-or-Occultism-H-P-Blavatsky.pdf
Dialogues on the Secret Doctrine
https://www.theosophy-ult.org.uk/wp-content/uploads/2014/06/secret-doctrine-dialogues.pdf