The name of this file is PHD-2022-Calendars04.pdf, which is a pdf format, and it is one of the files that can be downloaded and used easily.
Portable Document Format or PDF file, standardized as ISO 32000, is a file format developed by Adobe in 1992 to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems. You can open this file type with your web browser or a PDF reader like Adobe reader
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