The brochure is still on sale on ebay https://www.ebay.com/itm/234733446092BTW: there is another 1989 Tioga catalog https://www.ebay.com/itm/384706609075
I have played a bit with the pictures from those offers, it's far away from being good, but maybe a bit better at least.
Some pages are not captured unfortunately.
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I remember when I first saw those 26 x 1.95 city slickers on a couriers bike outside Covent Garden Cycles way back then, I thought they were the coolest thing ever.....semi-slicks on an MTB....radical.