[625] Bitter 1901².

[626] Baur 1904.

[627] Nienburg 1908.

[628] Krabbe 1882.

[629] Schulte 1904.

[630] Wainio 1890.

[631] Schikorra 1909.

[632] Harper 1900.

[633] Fraser 1907.

[634] Thaxter 1912.