ftp.nice.ch/peanuts/GeneralData/Documents/books/AlexNeXTSTEPSource.tar.gz#/NSProgramming/Chapter3_OOD/ShapeArea/Square.h

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#import "Rectangle.h"

@interface Square:Rectangle
{
}

-(float)calcArea;
-printHeight;
-printWidth;
-free;

@end

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.