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Thanking and appreciating volunteers is an important way of buildling relationships.  Sometimes this will be just a word, sometimes a thank you card for something particular, sometimes it could be a thank you celebration for a group of volunteers and some volunteers might appreciate a certificate thanking them for the number of hours that they have done in any given time.  This can be particularly important for young volunteers, building a CV and wanting to provide evidence of what they have been doing.  The type of certificate will depend on the volunteer but Microsoft Word and Publisher both have templates that can be adapted.