Greetings,
Some things learned for using the new Petersen Publishing/SEMA archives to share. For conducting a 'shotgun' search for simply typing in '1970 SCCA', I discovered some period Trans Am races are classified under 'Trans Am', while others are classified under 'Trans American'. What this means is that if you search for material using 'Trans Am 1970' you'll come up the Road America images but miss the substantial sweep of Laguna Seca as well as Riverside material otherwise accessible for use of this valued online archive. Type in 'Trans American 1970', and you'll likely miss the Road America race meet photos.
Oh - for checking, it seems only the 1970 season is so effected for no other results are generated for typing in 'Trans American' and turning up content from other years. All the same, be certain to try 'Trans American' as it would be a pity to miss was is availed thus.
Mike K./Swede70