The Bride of Larkspear, Hastings’s smutty love letter to Helena, is available in its entirety at your preferred vendor of fine e-books.
The text of Helena’s book on publishing is borrowed From Manuscript to Bookstall: The Cost of Printing and Binding Books, with the Various Methods of Publishing Them Explained and Discussed, a volume published in 1894 by Arthur Dudley Southam, now in the public domain.