'Irregular' was first published in 1967 and those to whom it was first circularised were invited to attend a regular monthly discussion group. The discussion group was called the Town Planning Research Group.
The newsletter was published monthly and the discussion group was also held monthly until 1971, and from then until 1979 at quarterly intervals. The discussion group met in Kevin Borland's office until 1973 and after that in the meeting room at Maurie Crow's ofice in Plumbers Union Building) Office, (see attachment extract from Ecoso, December 1979 for reasons for discontinuing the newsletter and discussion group).
After Maurie died in 1988 I revised Ecoso but not TRG. My intention was to produce about a dozen quarterly issues, offering access to some of our documents through a system of DATE (Documents Available Through Ecoso). About half of the subscribers were from those who had previously subscribed, (see comparison below).
In 1990, after the Crow Collection was acquired by the Victoria University (then the Footscray Institute of Technology), and with the formation of the Crow Collection Association, Ecoso became the newsletter for the Crow Collection Association.