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The appropriate source for additional information regarding restricted airspace like R-2531 is found in the Notes to Sectional Charts. This resource provides detailed and specific information about restricted areas, including their status, operating hours, and contact details for authorities overseeing that airspace. The Notes to Sectional Charts are designed to give pilots succinct information about the restrictions, ensuring they can navigate safely and legally around areas where certain flight operations may be prohibited or limited.

Other sources listed, while valuable, do not provide the same level of detail for specific restricted airspaces. The Aeronautical Information Manual offers broad guidelines and procedures but may not include the latest specific restrictions. Chart Supplements contain extensive data about airports and facilities but are less focused on isolated restricted areas. Visual Flight Rules navigation charts depict airspace but do not provide the comprehensive details necessary for understanding specific restricted airspace operational details. Thus, the Notes to Sectional Charts is the most appropriate and informative source for that specific question.