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pdf request - egg origins

Dear colleagues,
I would appreciate if anyone could send me a copy (pdf) of the following papers:
- Packard and Packard. 1980. Evolution of the Cleidoic Egg Among Reptilian 
Antecedents of Birds. Amer. Zool. (1980) 20(2): 351-362
- Romer. 1957. Origin of the amniote egg. Scientific monthly, 85: 57-63.
- Tihen. 1960. Comments on the Origin of the Amniote Egg. Evolution Vol. 14, 
No. 4 (Dec., 1960), pp. 528-531.
Thanks in advance, 
Bernat Vila