Sub Articulo 140.2

to have 2 figures with 2 captions in one figure environment you have to 
use the subfigure package.
>>er no, you can have any number of \caption commands in a figure
>>environment.
I this  case you could also enclose 2 figure environments in other 
evironment like minipage or center:
\begin{center}
\begin{figure}
\includegraphicx[....]{abc.eps}
\caption{..}
\label{..}
\end{figure}
\includegraphicx[....]{def.eps}
\caption{..}
\label{..}
\end{figure}
\end{center}
This will keep the figures on one page, even if this causes a overfull 
vbox.