Combinatorial Designs

The original publication may have contained graphics and more sophisticated formatting (such as hanging indents, borders, etc.) and typographical features (such as boldface, italics, underlining, etc.) Where we felt that significant meaning was lost by not including an illustration or that it was impossible to convey the full meaning of the text without the graphic, we have added to the text in order to convey the essential information. You may see references to graphics or illustrations that are not included in this text-only edition.