These are 2 booklets commemorating the 25th Anniversary of the Luxembourg Rotary & the 50th Anniversary of The Rotary Club, "Special Cancellation of Luxembourg City" ) one booklet is tan in color & other is Light Greenish in color, I have thrown in free, ( 2) 3F stamps in honor of  The Rotary Club 1905-1965...   Also  these booklets are  numbered on the back as shown.