Texts available as free PDF downloads:
16th - 18th century astrology (English language texts):
Bonatus, Guido - 146 Considerations - translated by Henry Coley, (in his Anima Astrologiae), 1676.
Coley, Henry - Key to the Whole Art of Astrology - 1676.
Coley, Henry - Ptolemy's Centiloquium - (1676, with annotations by Deborah Houlding).
Dariot, Claude - Briefe and Most Easie Introduction to the Stars - 1557.
Gadbury, John - Doctrine of Nativities & Horary Questions - 1557.
Gadbury, John - Nauticum Astrologicum - 1657.
Gadbury, John - The Nativity of Lewis the Fourteenth, King of France - 1680.
Gadbury, John - Of Thefts, Fugitives & Strays &c. - 1658
Griffin, Anthony - An Astrological Judgement Touching Theft - 1665.
Partridge, John - Mikropanastron (Vade Mecum) - 1662.
Ptolemy, Claudius Tetrabiblos - 2nd cent.
Thrasher, William - Jubar Astrologicum - 1671.
Culpeper & Decumbiture:
Culpeper, Nicholas - Directory for Midwives - 17th cent.
Culpeper, Nicholas - Opus Astrologicum - 1654.
Lilly's Life & Work:
Lilly, William - Christian Astrology, Volumes: I, II, III - 1659 reprint (facsimile).
Lilly, William - Christian Astrology, Vol I - annotated by D. Houlding: pp.i-24 | 25-26 | 57-68 | 69-86 | 86-105.
Lilly, William - Christian Astrology, Volume I & II (modern retype in Word) - 1647.
Lilly, William - Christian Astrology, Volume III - 1647.
Lilly, William - Several Observations Upon The Life And Death Of Charles I.
Lilly, William - William Lilly's History of His Life and Times - 1681.