This concerns the LANDIS family tree that you have on your web-site named jxl-axm.html. I also am a descendant of John LANDIS and Ann MUSSELMAN (my 6g-gp), and I was somewhat surprised to see the notation that for their daughters, Barbara and Veronica, you have no data. Veronica, at least, has many descendants.
Jacob LANDIS, son of John, died 1806, near Jersey Shore, Lycoming County, Pennsylvania.
Samuel LANDIS died 1771.
Barbara LANDIS married Samuel BAUER, son of Hans and Anne BAUER of Colebrookdale Township, then Philadelphia County, now Berks County, Pa.
Veronica married Michael BAUER (will signed 17 June 1784, probated 8 Nov 1784) son of Hans & Anne BAUER, brother of Samuel. They had three children, a daughter Fronica, who married Abraham SCHWENK, and whose descendant was Ralph Beaver Strassburger, who wrote and published "The Strassburger Family and Allied Families of Pennsylvania" (Gwynedd Valley, Pa., priv. publ.:1922) from which this information comes. Also Anna, who married Christian MOYER, and with whom her parents lived with. And Samuel (6 Aug 1746-18 Nov 1822) who married 10 March 1766 Elizabeth Pawling ZIEGLER, from whom I descend.