Returned Cover From US To Chihuahua

I picked this cover up for the auxillary marking from Chihauhau, Mexico. It looks like it is missing a finger tip on the pointing finger. I collect auxillary on US covers and this was the first I came across from Mexico. It was mailed March 19,1903 and returned to the us on May 29,1903. The main reason I am posting this cover is that there is a letter to James E. Dore and signed by W.Hoyt Yale. The letter is thanking Mr. Dore for some Mexican postal stationary he sent to Mr. Yale. I did a google and bing search but did not find any information on either gentleman. Has anyone heard of these gentleman? wt1? thanks for looking.

Vince

Here is a scan of the front.



Here is the back with markings.



Here is the letter.