<div class="description">
Subjects: Islamic philosophy; Mathematics; Music, Arabic; Cosmography</div>
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<dl><dd>Ikhwan al-Safa</dd>
<dd>Dieterici, Friedrich</dd></dl></div>
<dl><dd><a rel="nofollow" class="external free" href="https://archive.org/details/diepropaedeutikd00ikh">https://archive.org/details/diepropaedeutikd00ikh</a></dd>
<dd><a rel="nofollow" class="external free" href="https://archive.org/download/diepropaedeutikd00ikh/diepropaedeutikd00ikh.pdf">https://archive.org/download/diepropaedeutikd00ikh/diepropaedeutikd00ikh.pdf</a></dd></dl>