I don't think Andrea mentioned it in her response, but the place you can see Merald's marriage information is Washington Digital Archives (It's free)
Also note that the surname is LEENKNECHT- Be sure to put the H in there to find Burton and Merald in current records on google or ancestry, etc.
Washington Death Index, 1940-1996 about Forest E Lemoine Name: Forest E Lemoine Date of Death: 15 Sep 1989 Place of Death: Monroe Age: 88 Estimated Birth Year: abt 1901 Residence: Redmond Gender: Male SSN: 536-01-2073 Certificate: 025044
Social Security Death Index about Forest E. Lemoine Name: Forest E. Lemoine SSN: 536-01-2073 Last Residence: 98052Redmond, King, Washington, United States of America Born: 10 Jun 1901 Died: 15 Sep 1989 State (Year) SSN issued: Washington (Before 1951)
LE MOINE - Hilda, 12212 23rd South, Survived by husband Forest; daughter Mrs Burton Leenknecht; sister Mrs. Charles Wyman, Sr., all of Seattle. One brother, Ralph Morrison of Belmont, Wash. Five grandchildren. Member of First Presbyterian Church and Pioneer Telephone Club of Seattle. Services Friday, 2 p.m. Seattle Daily Times, Thursday, 14 July 1966, Page 19