Finally I now have, as far as I know, all of the rotary mower Scientific Publications / Gregory's Guides after I hunted down a copy of the elusive Scott Bonnar number 97 about 2 months ago but it finally arrived today!
Now for some reason I have a suspicion that numbers 98 and 423 could be rotary mowers manuals too but I can't seem to find any information to suggest this to be true but I can't remember finding out what number 98 and 423 are manuals for. If anyone thinks there could be information in any of these manuals that might be helpful, please don't hesitate to contact me and I can scan individual pages on a person to person basis.

So here is a picture of all of these manuals together, my copy of Scott Bonnar number 97 and a picture of all of my GG/SP manuals including my small engines manual in numerical order from right to left with some of my collectables.

These are all of the rotary mower ones as far as I know! If anyone else has information otherwise I'd love to hear it!!! Otherwise case closed and a complete set for me!!!

-Scott Bonnar series (to 1977) number 97
-Rover series (1978) number 99
-Mowers series (1971) number 100
-Rover series (1978) number 101
-Victa series (1974) number 102
-Victa series (1977) number 103
-Victa twin and lightweight series (1977) number 161
-Victa rotary mowers series (1955-81) number 200
-Victa rotary mowers series (1955-84) number 220
-Victa rotary mowers series (1955-87) number 403
-Rover rotary mowers series (1992) number 422
-Victa rotary mowers series (1955-91) number 424

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Just a sneaky drop in of a few of my collectables with the guides on the left.