Mercury Electric Outboard Thruster Models owners manual for R45, R50, D50.  Manual was printed in the 1992 and should be usable for any Thruster model of that vintage.  OEM part number is 90-824484 1192.  Manual is used and shows some wear but has no missing or ripped pages.  Picture is a scan of the front cover of the booklet you will receive.  Free shipping via US First Class Mail.  International available at actual cost.