Doverspun Yarn Question?

Cleaning my stash and came across two cones of yarn that I bought in the early to mid 1990's from Robin and Russ.

The manufacturer is Plymouth and the label says "Doverspun" but there is no other information about fiber content. 

I cannot find anything when I Goggle "Doverspun".

Does anyone remember this yarn?  If so, what can you tell me about fiber content?  I believe it may be a rayon/linen blend, but I'd like to know for sure before I try to use it.

Thanks.