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26 Απρ 2021 · Many consumers are reluctant to pay for news, but those that do turn to trusted sources. We rank news websites based on paid subscribers.
Downloadable Bibliography and Subject Index: A list of key publications on bluebirds. This list is organized alphabetically by author, and includes literature and research published prior to 1999. Bibliography of Literature and Research on the Genus Sialia (PDF)
Bluebird house plans, plans include a free PDF download (link at bottom of blog post), material list, drawings, and instructions.
The North American Bluebird Society is a non-profit education, conservation and research organization that promotes the recovery of bluebirds and other native cavity-nesting bird species in North America. (Read more below.) Fact Sheets, Plans, and Handouts.
Start learning the world’s languages. Bluebird is partly free (and without ads). An optional Premium plan is available with numerous benefits. Full-access institutional subscriptions are available for libraries, schools, companies, and governmental organizations. Learn as many as 164 languages.
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