It refers to the program of that Organists convention concert. It was something I came across in a search for the Fantasia and is on some Pipe Organ list. Only relevant insofar as it premiered the Fantasia for Organ and Brass.

https://list.uiowa.edu/scripts/wa.exe?A3=ind9308E&L=PIPORG-L&E=0&P=75974&B=--&T=text%2Fplain&header=1