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

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