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I understand you're looking for an as a "solid piece" — meaning a complete, standalone digital file (likely PDF) of the standard.
However, I must let you know that ("Microbiology of the food chain — Horizontal methods for surface sampling") is a copyrighted document sold by ISO member bodies (like ANSI, BSI, DIN, or ISO itself). It is not legally available as a free ebook in any complete, permanent format unless purchased. iso 18593 ebook