Norman Neuerburg sketch - value?

[jlyustman]

I recently acquired a sketch drawing of Norman Neuerburg in black ink, signed by him dated 1951. Any idea what the value would be?I read he worked for the Getty Museum in Los Angeles, and publish some books about California missions. The sketch shows a church facade with angels at the top. It is about 8" by 11". 

[mart]

https://www.google.com/?gws_rd=ssl#q=san+michele+lucca+italy

Here is the Mission San Michele- Lucca, Italy !!