this book is a must if you can get it. all about carpets, a consumers guide, by glen revere. i bought some copys in america a few years ago. and still sell them, but they are expensive originally $10 years ago but now fetch up to £40 on amazon. i sell mine cheaper. if you have got one i would like to know what you think. it really is a defining moment in history for claeners at that time and is still very relavent now.