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

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#import "AbstractShape.h"

@interface Rectangle:AbstractShape
{
	float height;
	float width;
}

-initHeight:(float)h width:(float)w;
-(float)calcArea;
-free;

@end

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