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I would like to ask a couple of questions to those who are lucky enough to have a copy of Vol. I of Contributions to a manual of palaearctic diptera. Is the families s'key include all the palearctic families? (including families not treated in the others volumes)

Is the description of adult features used in the keys exactly the same than in the manual of nearctic diptera?

Had someone the chance to compare the key to families from the manual with the key to families in the recent book "The european families of the diptera" in order to know if it is worth buying the later?

Thank you in advance for your help. (and sorry for the language)