Lee,
I can't locate those slides at the moment and just had not noticed the difference when I scanned them. At that time, I was using Technicolor processing and they did not always date stamp the slide mount. I know for sure I was there in '71 because I read the Spokane newspaper about the Jackson breakout. I am guessing the older slides were taken in 1969 or 1970 but I have no recollection of being there but I did go to Canada in '69 or '70. and I probably, maybe, possibly, went to Yakima.
Those are my photos I stole back off of Railpictures LATE last night while under the influence of vicodin---probably lucky to remember as much as I did.
Drew
drewj@earthlink.net