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Found John Elder, d. 1756 in Donna Logan's database:  (From ROBERT and ELEANOR, son Robert Jr. (1704-  )

http://www.familytrail.com/elder/RobertElderPaxtang/wc01/wc01_224.html

From Egle's "Pennsylvania Genealogies":
II. ROBERT ELDER,2 (Robert,1) b. in 1704, in Scotland; m. and had issue:
i. John, b. 1730; d. December, 1756, in Hanover; probably  unm.
6. ii. Robert, b. 1732; m. Mary Taylor.
iii. Samuel, b. 1734; m. Mary Robinson.
 iv. Isabel, b. 1736; m. Adam Breaden, concerning whom we have no record.
v. David, b. 1738; m. and removed, late in life, to Ohio, where he died. He had, among other chiidren, Joshua and Robert.
 vi. Elizabeth, b. 1740.
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