Oh, shit, there it is at the end. Silly me, I wrote too soon. Actually, it looks like they didn't use the acid that I was thinking, unless I'm reading it wrong. Oh well, in one of those french isosafrole articles from way back in 1950 or 60, they synthesize isosafrole through dehydration of the 1-propanol using the p-toluene sulfonic acid and get high yields. Oh, well. I guess that is the article that I was thinking about in terms of peculiar acid dehydration methodology. Sorry.