I found the "ELFERS" I was looking for at
http://www.ancestry.comthey now have the 1930 fed census which was taken in Manhatten in April 1930.
I looked under Marie L. ELFERS & found "HERMAN & KATHERINE ELFERS.
Herman b. GERMANY , as well as all his listed' relatives and Katherine b. NY -however her relatives b. GERMAN.
Herman was age 52 in April 1930 his wife Katherine was age 43. They Herman & Katherine had two children Marie Louise (ELFERS) LEWIS at that time age 9 and a son William age 12. Herman gave his age at marrying as 31. Herman was an "attorney".
Marie Louise ELFERS died Dec., 14, 2001-she died Marie Louise Lewis -in Anne Arundel Co-MD.