The New Encyclopaedia Britannica．Volume 8，Micropaedia : Ready reference The New Encyclopaedia Britannica．Volume 1，Micropaedia : Ready reference The New Encyclopaedia Britannica．Volume 3，Micropaedia : Ready reference The New Encyclopaedia Britannica．Volume 4，Micropaedia : Ready reference The New Encyclopaedia Britannica．Volume 5，Micropaedia : Ready reference The New Encyclopaedia Britannica．Volume 6，Micropaedia : Ready reference The New Encyclopaedia Britannica．Volume 7，Micropaedia : Ready reference The New Encyclopaedia Britannica．Volume 9，Micropaedia : Ready reference The New Encyclopaedia Britannica．Volume 11，Micropaedia : Ready reference The New Encyclopaedia Britannica．Volume 12，Micropaedia : Ready reference