Galena fragments. From Naqada Tomb 1286. Sample taken for analysis by Dr.N.H. Gale, Oxford, 1978. Lead isotope result: 208pb/206pb 207pb/206pb 206pb/204pb 2.01434 0.80710 19.4362. Neutron Activation result: Cu 22.57, Au .0152, As 1.43, Sb. .14, Ag .97.
- Baumgartel, Elise Jenny, Naqada supplement, p. XXXVII - Petrie, William Matthew Flinders, Naqada and Ballas: 1895 - Gale, Noel H., Sources of Galena, Lead and Silver in Predynastic Egypt
