Looking for some 4-inch information for a member I came across a list of ARDE projects dating from the 1950s and 60s. There are about 1500 entries but the following extract of titles will probably be of interest to those who like 'odd' calibres. Apologies if it is hard to read.
View attachment Parent Numbers Odd Calibres3.pdf
View attachment Parent Numbers Odd Calibres3.pdf