Merci, Mary. There is a lot more on-line that there used to be for these areas, and I thank you for advising me to look on-line again. The maps will be good to use, and I shall look up the streets. I have 1860's birth certificates for Aubervilliers, they are interesting because they give time of birth. Some years ago my mum went to Aubervilliers and the Maire staff were very helpful, and searched records for her. I hope to be able to get pictures of the streets, or early photographs when these communes were tiny and not perhaps part of Paris.