Please Help Me Identifying These Stamps !!

I found these three Nicaraguan stamps but can't seem to find them in Scott? Thank you for your help.

tazzmann30: the first item is from the Nicaraguan province of Zelaya, also know as Bluefields. You can find these issues listed at the back of the Nicaraguan section in Scott. Note that Scott talks about these issues being heavily counterfeited, and otherwise faked. See the note about stamps with overprints similar to yours being created to fill dealers' orders.

Can't make out the markings on the other two. Sorry.

The first stamp is at the end of the Nicaragua listing in Scott there is a section for the Province of Zelaya ,the 1L numbers . Yours is real not like most which are counterfeits.

The other two look like revenues .

Darn =Steve posted as I was typing , The other two look like railroad revenues

The 2nd and 3rd could be 1911 scott type A21. Revenue stamps surcharged.

My stamp has a black overprint on reverse. If they do not have that, I cannot help. At least its somewhere to start.

The last Stamp stamp has this on the back. Sorry I should have included this photo with the first group. The other two (1st and 2nd images) have no ovpt. on back.