jimdoc
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Looks like some new ones on Internet Archive.
Gilchrist;
Methods for the separation of platinum, palladium, rhodium, and iridium from one another and for their gravimetric determination (1934)
http://www.archive.org/details/methodsforsepara12329gilc
A method for the separation of ruthenium from platinum, palladium, rhodium, and iridium (1934)
http://www.archive.org/details/methodforseparat12328gilc
A method for the separation of rhodium from iridium and the gravimetric determination of these metals (1932)
http://www.archive.org/details/methodforseparat94547gilc
Investigation of the Platinum Metals: IV. Determination of iridium in platinum alloys by the method of fusion with lead (1923)
http://www.archive.org/details/scientificpapers48319geor
J.S. Acken;
Some physical properties of platinum-rhodium alloys (1934)
http://www.archive.org/details/somephysicalprop12224acke
Gilchrist;
Methods for the separation of platinum, palladium, rhodium, and iridium from one another and for their gravimetric determination (1934)
http://www.archive.org/details/methodsforsepara12329gilc
A method for the separation of ruthenium from platinum, palladium, rhodium, and iridium (1934)
http://www.archive.org/details/methodforseparat12328gilc
A method for the separation of rhodium from iridium and the gravimetric determination of these metals (1932)
http://www.archive.org/details/methodforseparat94547gilc
Investigation of the Platinum Metals: IV. Determination of iridium in platinum alloys by the method of fusion with lead (1923)
http://www.archive.org/details/scientificpapers48319geor
J.S. Acken;
Some physical properties of platinum-rhodium alloys (1934)
http://www.archive.org/details/somephysicalprop12224acke