The book of "Kay la nansa" is a scientific investigative work. Its author is knowledgeable in Palestinian geography and with complete command he has presented more than 4.000 Palestinian villages which have been destroyed by the occupiers. In introducing each village, Dr. Walid Al- Khalidi has provided precise information, the number of family member of houses … The principles of a precise scientific investigation have been followed in the book. All topics have been dealt with by reference to reliable sources while 350 photographs and 430 maps have been included in the book to support its subject matter.