TY  - JOUR
T1  - Some Observations upon Gems or Precious Stones; More Particularly Such as the Ancients Used to Engrave upon, by Robert Dingley, Esq
JF  - Philosophical Transactions (1683-1775)
VL  - 44
SP  - 502
EP  - 506
PY  - 1753/01/01/
UR  - http://dx.doi.org/10.1098/rstl.1746.0094
M3  - doi:10.1098/rstl.1746.0094
AU  - Dingley, R.
ER  -