If you are looking for the specific edition referenced as "55," it likely contains a curated selection of her most potent hymns, perhaps arranged for a specific 55-day recitation cycle or simply a specific publication page count that devotees recommend.
(1908–1978). This "manual of devotion" is a central spiritual text for followers of the Paramarth Sadhana Kendra The Significance of Balopasana Kalavati Aai Balopasana Pdf 55
: Specific prayers to Lord Krishna and Gopal to be recited during worship. If you are looking for the specific edition
You can find digital versions (PDFs) of the Balopasana through the following official or community sources: Kalavati Aai Balopasana Pdf 55