Actually, a couple of fanzines in the 70's were published that contained fairly comprehensive listings of the filming dates of the episodes based on the clapperboards shown in the film clips. Not to take anything away from Asherman's hard work, but those fanzines pre-dated his Compendium. Of course, the Compendium was more widely available.
My point exactly. From where I was in Australia, it was likely 70s fans could find a commercial "ST Concordance" (or the first two seasons episode guide in "The Making of Star Trek") quite easily, but not so the fan editions of the Concordance, nor many of the hundreds of US fanzines. Even "Starlog" episode guides for ST did airdate order until the 80s.
My strong memory of the "ST Compendium" is that it was the first time many of us had access to TOS production numbers.
Even the FAQ booklet issued by the ST Welcommittee had the same ol' airdate order.