Hi John, have you been in contact with Ron Edwards of Cairns, North Queensland? Ron is probably Australia's most prolific living collector. Not surprisingly I've not seen the limited edition below:

Title:        Australian bawdy ballads / by Ron Edwards         
Main Author:        Edwards, Ron, 1930-         
Publication:        Holloway Beach, Qld. : Rams Skull Press, 1973         
Description:        55 leaves : music ; 33 cm         
Notes:        Limited ed. of 100 copies.
Rare Books holds copy no. 68, signed by the author
Hardie Collection holds copy no. 92 signed by the author
Includes index.         
Series:        Australian folklore - occasional paper ; no. 2         
ISBN:        0909901104 (pbk.)         
Subject(s):        Ballads, English--Australia
Bawdy songs--Australia         
Other Author(s):        Rams Skull Press         
Record no:        90235         
Location        Held at Cannon Hill. To request, phone 3840 7829, Mon-Fri         
Call Number:        RB A821.04408 1973         
Holdings note:        c1
Rare Books holds copy no. 68, signed by the author
Hardie Collection holds copy no. 92 signed by the author         
Status:        Check Location information above

Regards, John