A map of your survey square can be downloaded from the House Martin Online data entry pages
Survey Instructions and Codes – Full versions
One-page Summary Instructions and Codes
Health and Safety information
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BTO Bird ID - Hirundines and Swift Bird identification video describing how to identify hirundines (House Martin, Sand Martin and Swallow) and the similar, but unrelated, Swift.
PDF files may be viewed using Adobe Acrobat Reader, which can be downloaded free of charge from the Adobe web site.