The type of publication that became the major means of spreading political ideas is a- pamphlets.
A publication can be described as one that is been made that support communication with the public.
It should be noted that Publications are can be printed on paper and there are online publications that are delivered via the Internet.
Some of the examples of publication are:
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What type of publication became the major means of spreading political ideas ?
a- pamphlets
b- almanacs
c- books
d- newspapers