You have a fine family tree. But, I could not find the name of a person born in 1907 that you may be researching.
I see you have not made any other Rootsweb Message board inquiries at least under this user name. When you post, provide the name/data of the person you seek, in that way other family members may see your post and volunteers know exactly who you seek. Also, since you do have a good tree, it the person you seek is in the tree, post the link for that person's data.
The quick answer to your question, 1907 hasn't been indexed yet. Here is a listing of names and months:http://images.archives.utah.gov/cdm4/results.php?CISORESTMP=...
If the person isn't listed, there could be a number of reasons. Yes, fire, flood, earthquake, invasion of aliens from another planet, they weren't born they just appeared... Or, the birth wasn't recorded as required, the record was lost, the record wasn't transcribed into the databases, it wasn't photographed into a microfilm, etc.