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40 Witty Campaign Posters for a Cause
From http://www.2expertsdesign.com/graphics/40-witty-campaign-posters-for-a-cause
“Non-profit organizations use posters to deliver a particular message. These help inform people about current issues, problems and even the possible consequences of their actions. With a sentence that contains strong words or images, these posters give more impact than common commercial posters.
To give you an idea, here are 20 sample campaign posters to provoke your imagination. Enjoy!”