Notes: That these three sources refer to the same edition is inferred; crucially that the first two sources refer to the cheap paperbound ed.
[1] OCLC:
-- 2nd ed.; "Copy lacks original wrappers"
[2] Price 50 cents from brief review
SF Chronicle 1891-06-21 p7 (for sale by The Bancroft Company; paper)
and from
Publishers Weekly (below)
[3] "The initial title in the collection, a romantic future projection called ''The Auroraphone'' by Cyrus Cole, met with severe criticism from those who deemed it an intrusion in the series and not in keeping with
Unity's character." (That is, those Unitarians on the Board.)
--Allen Ruff,
We Called Each Other Comrade: Charles H. Kerr & Company, Radical Publishers (PM Press, 2011), p58
- Probably April or May 1891
- "in their new series No. I of Unity Library", this novel from Kerr --The Inter-Ocean (Chicago) 1894-04-25
- this novel UL#1, 50c; UL#2 will be ready June 15 --Publishers Weekly 1891-05-02 p637
- UL comprises cheaper paperback editions --evident from Kerr Catalog 1891-08
