Help me identify old photos and Hobo Poems

[rustyattic]

I'm trying to figure out what kind of photos these are.  I think the first are tintype (based on what I've seen on ebay.)  I'm unsure of the 2nd.  It's thick and plastic like.  The last ones are on cardboard, are they considered cabinet?
The last thing I found in a folder.  It's a couple pages of stories/poems.  I googled, but didn't see anything.  Trash or treasure? 

[greenacres]

There many pld photos on eBay. The price depends on the topic of the picture. I never think phptos are trash. There is a specific site that research old photos.