Phyl, Thanks for the information and link to NARA. I have completed the request form with the information I have and will mail it tomorrow.
I am the family genealogist, and this is one branch that has eluded me for almost a decade. This is the closest I've gotten to completing this limb of the family tree.
If you care to read it, here's my story: Harry B. had a sister Harriet Marie Flounders, born ca. 1895 in Media. I was given her photo album with pictures from 1912/13, and have been trying to return it to the surviving members of that line. Harriet M. or simply "Marie" married Edwin Douglas Read and the 1920 Census shows them living in L.A. But by 1930, Edwin was living in Chicago and listed as widowed. I have ordered his 1969 Florida death certificate to get an exact date of death so that I can get his obit to look for any survivors of a possible second marriage who might know what happend to his first wife Marie. Try as I might, I have been unable to find Marie's date and place of death. I am assuming Marie died childless, because the only survivors listed in Harry B. and Marie's mother's Pasadena, CA obit in 1932 were the two children of Harry B. and Mary Monks Flounders, a son also named Harry B. born in 1921 and a daughter Jennett, probably Jeannette (called "Jeanne") born in 1922.
I have traced Jeanne, who married Donald C. Buck. Unfortunately, Jeanne and 3 of her children were killed in a head-on collision near La Junta, CO on August 5, 1962. I am awaiting obits from the Pueblo Chieftan and the La Junta Tribune to see if she had any other children who escaped the crash. Meanwhile, I'm still looking for Harry B. Jr. and am excited about the possibility you raised: that Capt. Harry B. Flounders Sr. might have married a second wife and produced other heirs. All signs are pointing toward Chicago.
If I find that the entire branch of the family is dead, I will donate the album to the Altadena CA Historical Society, because many of the 1912 photos are of Eaton Canyon, which is located in that community.
That's it...more than you asked for. If you've read this far, then I applaud your patience. I honestly have learned a lot from you and appreciate the generosity of your time and interest.