The specific heats of plutonium and neptunium metal have been measured from 13 and 7.5 K respectively, to 300 K. Both metals have very high electronic specific heats of 15.9 and 14.2 mJ mol
-1
K
-2
. A small anomaly in plutonium at about 60 K was found and is possibly caused by magnetic ordering. The specific heat of neptunium is a smooth function over the whole temperature range.
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