Perhaps you should try some spelling variations:
"specimens philosophiae slavicae" » "specimen philosophiae slavicae", "species philosophy slavicae", "species philosophers slavicae", "specimens philosophiae publice", "specimens philologica slavicae", "specimens philosophiae suae"
"specimen philologiae slavicae" » "specimina philologiae slavicae", "specimens philological slavicae", "specimen philosophiae slavicae", "specimen philologica slavicae", "specimen philologica slavica", "specimen philologie slave"

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