Dear Dr. Cullen,
I have applied for a job as FIELD GEOLOGIST as I mentioned in my last letter. The company now wants two recommendation letters from my referees to be sent direct to them.
Please forgive me for troubling you again. As you have said you would be one of my referees, could you please write a letter of recommendation for me and send it directly to the company? I have enclosed a stamped addresses envelop for mailing purposes.
Thank you once again for your support.