A while back we picked up a nice hiking map of Mt Rainier map from Earthwalk Press. It has lots of trails all over the park, including the Wonderland Trail and the Northern Loop. The map is from 2003, so some things have changed since then.
One thing that caught my eye was Redstone camp. It doesn’t show up on current maps, and I couldn’t find much information online. Our map puts it west of the Ranger cabin, further to the south and across the trail.
This site says that James camp was formerly Redstone camp, but the official NPS map shows James Camp further north up by the lake. Maybe they moved it? It’s probably worth asking at a ranger station to find out more. If the camp is still in existence, it might be a fun side trip.