origin of SHA 224 initial hash values

[Jeremiah Rogers]

I'm having trouble pinpointing the origin of the initial hash values 
for SHA 224 and, for that matter, 128. These values are defined as hex 
representations of cube roots of primes for sha-1 of lengths 256, 384 
and 512, but  I can't find where they were obtained for the shorter 
lengths.

Thanks and apologies if this is something well known.

- jeremiah

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